Sound-reproducer.



J. J. HARRISON & T. H. HUPFER.

SOUND REPRODUOER. APPLICATION FILED AUG. 20, 1913.

Patented Feb. 9, 1915.

UNITED sTATEs PATENT OFFICE.

JAMES J. HARRISON AND THEODORE H. HUPFER, OF ST. LOUIS, MISSOURI.

SOUND-BEf-QRODUCER.

Specification of Letters Patent.

Patented'Feb. 9, 1915.

Application filed August 20, 1913. Serial No. 785,708.

' To all 10710722 it may concern:

Be it known that we, JAMES J. HARRISON and Tnnonoan H. HUPFER, citizens of the United States, residing at the city of St. Louis, State of ,Missouri, have invented a certain new and useful Improvement in Sound-Reproducers, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make anduse the same, reference being had to the accompanymg drawings, forming part of this specification, in which,-

Figure 1 isa view illustrating our improved sound reproducer in operative position. Fig. 2 is a bottom plan view of the same. Fig. 3 is a vertical sectional view.

This invention relates to a new and useful improvement in sound reproducers. for phonographs, graphophones, and the like, the object being to construct a reproducer which will be sensitive in the reproduction of sound from vertical cut records, and at nected to the horn of the machine.

7 is the diaphragm mounted in the reproducer casing which diaphragm is connected to the reproducing stylus by means of aspring 8 and an arm 9. Spring 8 is of such strength that it will support or counterbalance the weight of the reproducer w1thout being stretched to its limit and at the same time sufiiciently pliable to yield to abnormal relative movements of the reproducer casing or arm and the stylus when the latter is in engagement with the record. The arm 9 which carries the reproducing stylus; and to which the spring 8 is connected, is p votallv mounted upon a pin 10 passing through lugs in a cross bridge 11 forming the .base plate of the sound reproducing box The mounting of the arm 9 is such that it has absolutely no lateral or longitudinal play, and cnnsecguentlv. the stylus is capable which the arm is pivoted is arranged at sub-' stantially right angles to the direction of the record grooves. By virtue of this fashon of mounting, when the stylus is operated in a record groove it will have the vertical movement necessary to reproduce from the vertical cut record, and being incapable of any other movement, and being held in engagement in thev groove by the spring 8 and weight of the reproducer arm, it will automatically feed itself and the reproducer arm across the record by its tracking in the groove.

An important consideration is the proper tensioning of spring 8 so that it will have the proper resiliency to compensate for excessive movements of the reproducer, and at the same time the proper inertia to transmit the finer and more delicate vibrations from the record to the diaphragm. A reproducer of this type may be used upon a machine, such as the well known Victor or Columbia, or other machine not equipped with mechanism for feeding the reproducer across the record, and thereby permit the playing of vertically cut records on such machine.

What we claim is:

A sound reproducer comprising a casing, a diaphragm mounted thereon in position such that one face thereof is presented toward the record when in operative position, said casing being provided with a bridge member, a stylus arm pivoted on said bridge member so that its extremities are capable of movement toward and from said diaphragm only one of the extremities of said arm being provided with a stylus adapted to cooperate with the record, the other extremity of said arm being connected directly to the diaphragm by 'a resilient member having sufficient resiliency to yield to abnormal JAMES J. HARRISON. THEODORE H. HUPFER.

Witnesses M. P. SMITH,

A. .HANDEL. 

